CN103035248B - Encoding method and device for audio signals - Google Patents

Encoding method and device for audio signals Download PDF

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CN103035248B
CN103035248B CN 201110297791 CN201110297791A CN103035248B CN 103035248 B CN103035248 B CN 103035248B CN 201110297791 CN201110297791 CN 201110297791 CN 201110297791 A CN201110297791 A CN 201110297791A CN 103035248 B CN103035248 B CN 103035248B
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encoding
method
device
audio
signals
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CN103035248A (en )
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苗磊
刘泽新
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华为技术有限公司
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/26Pre-filtering or post-filtering
    • G10L19/265Pre-filtering, e.g. high frequency emphasis prior to encoding
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/008Multichannel audio signal coding or decoding, i.e. using interchannel correlation to reduce redundancies, e.g. joint-stereo, intensity-coding, matrixing
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/0204Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using subband decomposition
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/087Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters using mixed excitation models, e.g. MELP, MBE, split band LPC or HVXC
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16Vocoder architecture
    • G10L19/18Vocoders using multiple modes
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/038Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00Speech or voice analysis techniques not restricted to a single one of groups G10L15/00-G10L21/00
    • G10L25/03Speech or voice analysis techniques not restricted to a single one of groups G10L15/00-G10L21/00 characterised by the type of extracted parameters
    • G10L25/18Speech or voice analysis techniques not restricted to a single one of groups G10L15/00-G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band

Abstract

本发明涉及一种音频信号编码方法和装置,所述方法包括:将音频信号分为高频音频信号和低频音频信号;利用低频音频信号特征对所述低频音频信号用相应的低频编码方式编码;根据所述低频编码方式和/或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码。 The present invention relates to an audio signal encoding method and apparatus, the method comprising: a high-frequency audio signal into a low frequency audio signal and an audio signal; a low frequency audio signal by using the low frequency characteristics of the audio signal encoded in the corresponding low frequency; the characteristic of the low-frequency encoding and / or the audio signal, the mode selection frequency bandwidth extension coding the audio signal. 本发明实施例音频信号编码方法和装置可以根据低频信号的编码模式和/或音频信号的特点来确定高频音频信号带宽扩展的编码方式,从而弥补带宽扩展局限于采用单一编码模式,实现自适应的编码,优化音频编码质量。 Example audio signal encoding method and apparatus according to the present invention may be determined in a high-frequency bandwidth extension of the audio signal coding scheme encoding mode according to the characteristics of the low frequency signal and / or audio signal to compensate for the bandwidth extension limited to a single encoding mode, adaptive encoding, audio encoding quality optimization.

Description

音频信号编码方法和装置 Audio signal encoding method and apparatus

技术领域 FIELD

[0001] 本发明涉及通信领域,尤其涉及一种音频信号编码方法和装置。 [0001] The present invention relates to communication field, and particularly relates to an audio signal encoding method and apparatus.

背景技术 Background technique

[0002] 在音频编码时,由于比特率的限制和考虑到人耳的听觉特性,所以优先编码低频带音频信号的信息,而丢弃高频带音频信号的信息。 [0002] In audio coding, the bit rate due to limitations and considerations to the human ear, so that the priority information is coded lowband audio signal, the discard information of the high frequency band audio signal. 但随着网络技术的发展,网络带宽限制越来越小,同时随着人们对音质越来越高的要求,希望通过增加信号的带宽而恢复高频带音频信号的信息。 But with the development of network technology, network bandwidth limits become smaller and smaller, while as people increasingly high quality requirements, hopes to increase the bandwidth of the signal restored high frequency band audio signal information. 由此提高音频信号的音质,可以通过带宽扩展(BandWidth Extens1n,BffE)技术实现。 Thereby improving the sound quality of the audio signal, can be implemented by bandwidth extension technique (BandWidth Extens1n, BffE).

[0003] 带宽扩展可以扩大音频信号频带范围、提高信号质量,例如G.729.1中的时域(Time Domain, TD)带宽扩展算法,活动图像专家组(Moving PictureExpertsGroup, MPEG)中的频带复制(Spectral Band Replicat1n, SBR)技术,以及国际电信联盟(Internat1nal Telecommunicat1n Un1n, ITU-T)G.722B/G.711.1D 中的频域(Frequency Domain, FD)带宽扩展算法。 [0003] bandwidth extended audio signal frequency range can be enlarged, to improve the signal quality, e.g. G.729.1 in the time domain (Time Domain, TD) bandwidth extension algorithm SBR (Spectral Moving Picture Experts Group (Moving PictureExpertsGroup, MPEG) of Band Replicat1n, SBR) technology, and the International Telecommunication Union (Internat1nal Telecommunicat1n Un1n, ITU-T) G.722B / G.711.1D frequency domain (frequency domain, FD) bandwidth extension algorithms.

[0004] 图1和图2为现有技术的带宽扩展的示意图,即无论低频(如小于6.4kHz)音频信号的编码是时域编码(TD coding)或者频域编码(FD coding),而高频(如6.4_16/14kHz)音频信号的带宽扩展都为时域带宽扩展(TD-BWE)或者都为频域带宽扩展(FD-BWE)。 [0004] FIG. 1 and FIG. 2 is a schematic diagram of bandwidth extension prior art, i.e., whether a low frequency (e.g., less than 6.4kHz) the encoded audio signal is a time-domain coding (TD coding) or the frequency domain coding (FD coding), while high frequency (e.g. 6.4_16 / 14kHz) bandwidth extended audio signal are time-domain bandwidth extension (TD-BWE) or both frequency domain bandwidth extension (FD-BWE).

[0005] 所以现有技术中,对于高频的音频信号的编码只是时域带宽扩展的时域编码或只是频域带宽扩展的频域编码,而不会考虑低频音频信号的编码方式,也不会考虑音频信号的特性。 [0005] Therefore the prior art, for encoding an audio signal only when the high-frequency bandwidth extension domain time domain encoding or frequency domain only in the frequency-domain bandwidth extension encoding, the encoding method does not consider the low-frequency audio signals, not It will consider the characteristics of the audio signal.

发明内容 SUMMARY

[0006] 本发明实施例的音频信号编码方法和装置,在带宽扩展时可以根据低频信号的编码方式和/或音频信号的特点来对高频音频信号进行编码,实现自适应编码,而非固定编码模式。 [0006] The present invention is an audio signal encoding method and apparatus of the embodiment, when the bandwidth extension may be performed according to the encoding characteristics of the low frequency signal and / or audio signal to the high frequency audio signal coding, adaptive coding, rather than fixed coding mode.

[0007] 本发明实施例提供了一种音频信号编码方法,所述方法包括: [0007] Example embodiments provide an audio signal encoding method of the present invention, the method comprising:

[0008] 将音频信号分为高频音频信号和低频音频信号; [0008] The high-frequency audio signal into a low frequency audio signal and an audio signal;

[0009] 根据低频音频信号的特征对所述低频音频信号利用相应的低频编码方式编码; [0009] encoded in the corresponding low frequency of the low frequency audio signal by using the feature of the low frequency audio signal;

[0010] 根据所述低频编码方式和/或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码。 [0010] The characteristic of the low-frequency encoding and / or the audio signal, the mode selection frequency bandwidth extension coding the audio signal.

[0011] 本发明实施例提供了一种音频信号编码装置,所述装置包括: [0011] Example embodiments provide an audio signal coding apparatus according to the present invention, the apparatus comprising:

[0012] 划分单元,用于将音频信号分为高频音频信号和低频音频信号; [0012] dividing unit for high-frequency audio signal into an audio signal and a low frequency audio signal;

[0013] 低频信号编码单元,用于根据低频音频信号的特征对所述低频音频信号利用相应的低频编码方式编码; [0013] The low frequency signal coding unit for the low-frequency characteristic of the audio signal with the corresponding encoded in the low frequency audio signal;

[0014] 高频信号编码单元,用于根据所述低频编码方式和/或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码。 [0014] the high frequency signal encoding unit for encoding said low frequency characteristic and / or the audio signal, the mode selection frequency bandwidth extension coding the audio signal.

[0015] 本发明实施例音频信号编码方法和装置可以根据低频信号的编码模式和/或音频信号的特点来确定高频音频信号带宽扩展的编码方式,避免带宽扩展时不考虑低频信号的编码模式和音频信号的特点,从而弥补带宽扩展局限于采用单一编码模式,实现自适应的编码,优化音频编码质量。 [0015] Example audio signal encoding method and apparatus according to the present invention may be determined in a high-frequency bandwidth extension of the audio signal coding scheme encoding mode according to the characteristics of the low frequency signal and / or audio signals, avoid considering the bandwidth extension coding mode of the low frequency signal and the characteristics of the audio signal to compensate for the bandwidth extension limited to a single encoding mode, adaptive coding, audio coding quality optimization.

附图说明 BRIEF DESCRIPTION

[0016] 图1为现有技术的带宽扩展的示意图之一; One [0016] FIG. 1 is a prior art schematic diagram of bandwidth extension;

[0017] 图2为现有技术的带宽扩展的示意图之二; [0017] FIG. 2 is a prior art bandwidth extension is a schematic diagram of the two;

[0018] 图3为本发明实施例音频信号编码方法的流程图; [0018] FIG 3 a flow diagram of the audio signal encoding method embodiment of the present invention;

[0019] 图4为本发明实施例音频信号编码方法的带宽扩展示意图之一; [0019] Fig 4 a schematic view of one embodiment of the bandwidth extended audio signal encoding method embodiment of the invention;

[0020] 图5为本发明实施例音频信号编码方法的带宽扩展示意图之二; Bandwidth [0020] FIG. 5 of the present invention audio signal encoding method embodiment schematic view of the two extensions;

[0021] 图6为本发明实施例音频信号编码方法的带宽扩展示意图之三; [0021] Fig 6 a schematic view of three of the bandwidth extended audio signal encoding method embodiment of the embodiment of the present invention;

[0022] 图7为ITU-T G.718中的分析窗示意图; [0022] FIG. 7 is a schematic diagram of the analysis window in the ITU-T G.718;

[0023] 图8为本发明音频信号编码方法的不同高频音频信号的加窗示意图; [0023] Figure 8 is a schematic view of a different windowing the audio signal frequency audio signal encoding method of the invention;

[0024] 图9为本发明音频信号编码方法中基于高频信号高延时窗的BWE示意图; [0024] FIG. 9 audio signal encoding method in a high-frequency signal BWE schematic window based on the delay of the present invention;

[0025] 图10为本发明音频信号编码方法中基于高频信号零延时窗的BWE示意图; [0025] FIG. 10 is a schematic view BWE frequency signal based on zero-delay window audio signal encoding method of the invention;

[0026] 图11为本发明实施例音频信号处理装置的示意图; [0026] FIG. 11 is a schematic of an audio signal processing apparatus of the embodiment of the present invention;

[0027] 图12为本发明实施例另一音频信号处理装置的示意图。 [0027] FIG. 12 is a schematic of another embodiment of an audio signal processing apparatus of the embodiment of the present invention.

具体实施方式 detailed description

[0028] 下面通过附图和实施例,对本发明的技术方案做进一步的详细描述。 [0028] The following drawings and embodiments, detailed description of the further aspect of the present invention.

[0029] 本发明实施例可以根据低频带音频信号的编码方式和音频信号的特点来确定频带扩展的方法是时域带宽扩展还是频域带宽扩展。 [0029] Embodiments of the invention may be determined according to the characteristics of the audio signal coding mode and a low frequency band audio signal band expansion method is a time domain or frequency domain bandwidth expansion bandwidth extension.

[0030] 这样当低频编码是时域编码时,高频编码可以是时域带宽扩展,也可以是频域带宽扩展;而低频编码是频域编码时,高频编码可以是时域带宽扩展,也可以是频域带宽扩展。 [0030] When such coding is a low-frequency domain coding, the coding may be a high frequency bandwidth extension time domain, a frequency domain may be a bandwidth extension; and low frequency domain coding is encoding, frequency domain encoding may be time bandwidth expansion, It can also be frequency-domain bandwidth expansion.

[0031] 图3为本发明实施例音频信号编码方法的流程图,如图所示,本发明实施例音频信号编码方法具体包括如下步骤: [0031] FIG 3 a flow diagram of the audio signal encoding method embodiment of the present invention, as shown in FIG embodiment audio signal encoding method embodiment of the present invention includes the following steps:

[0032] 步骤101,将音频信号分为高频音频信号和低频音频信号; [0032] Step 101, the audio frequency signal into a low frequency audio signal and an audio signal;

[0033] 因为低频的音频信号需要直接编码,而高频的音频信号必须经过带宽扩展来进行编码; [0033] Since the low-frequency encoded audio signal the need for direct, high-frequency audio signal must be encoded after bandwidth extension;

[0034] 步骤102,根据低频音频信号的特征对所述低频音频信号利用相应的低频编码方式编码; [0034] Step 102, according to the characteristic of the low frequency audio signal encoded in the corresponding low frequency audio signal by using the low frequency;

[0035] 对低频音频信号编码具有两种方式,可以是时域编码或频域编码方式,例如对于语音音频信号,则利用时域编码对低频语音信号进行编码,而对于音乐音频信号,则利用频域编码对低频音乐信号进行编码;因为通常来讲说语音信号采用时域编码的效果比较好,例如码激励线性预测(Code ExcitedLinear Predict1n, CELP),而音乐信号采用频域编码的效果比较好,例如使用改进离散余弦变换(Modified Discrete Cosine Transform,MDCT)或快速傅立叶变换(Fast Fourier Transform, FFT)等。 [0035] The embodiment has two low-frequency audio signal is encoded, it may be time domain encoding or frequency domain encoding, for example, an audio speech signal, the low-frequency speech signal is encoded using a time domain coding and for audio music signals, the use of frequency domain coding the low frequency of music signal is encoded; because generally speaking voice signal using said time domain coding results were better, for example, code excited linear prediction (code ExcitedLinear Predict1n, CELP), and the effect of using a music signal frequency domain coding is better , for example, modified discrete cosine transform (Modified discrete cosine transform, MDCT) or fast Fourier transform (fast Fourier transform, FFT) and the like.

[0036] 步骤103,根据低频编码方式或音频信号的特征,选择带宽扩展模式对高频音频信号编码。 [0036] Step 103, the feature coding mode or the low frequency audio signal, selecting a high frequency bandwidth extension mode encoding an audio signal pair.

[0037] 本步骤是说明了对高频音频信号编码时的几种可能性,一是根据低频信号的编码方式来决定高频音频信号的编码方式,二是根据音频信号的特征来对决定高频音频信号的编码方式,三是同时参考低频信号的编码方式和音频信号的特征来对决定高频音频信号的编码方式。 [0037] This step is a diagram illustrating several possibilities for the high frequency audio signal during encoding, one encoding mode is determined according to the frequency of an audio signal encoding low-frequency signal, the second is high according to the characteristics of the audio signal to be determined encoding the audio signal frequency, while three reference features is an audio signal coding method and the low frequency signal to the high-frequency audio coding mode decision signal.

[0038] 低频音频信号的编码方式可能是时域编码或者频域编码,而音频信号的特征可以是语音音频信号或者音乐音频信号,高频音频信号编码方式可以是时域带宽扩展模式或者频域带宽扩展模式,对于高频音频信号的带宽扩展需要参考低频音频信号的编码方式或音频信号特征来编码。 [0038] encoding low-frequency audio signal may be a time domain encoding or frequency domain encoding, and the characteristic of the audio signal may be a voice or music audio signal is an audio signal, a high frequency audio signal may be a time-domain coding mode or a frequency-domain bandwidth expansion bandwidth extension mode, for high-frequency bandwidth extension of the audio signal need to refer to an audio signal coding scheme or a low-frequency characteristic of the audio signal is encoded.

[0039] 根据所述低频编码方式或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码,选择的带宽扩展模式与低频编码方式或音频信号的特征对应,属于同一个域编码方式。 [0039] The low-frequency characteristic of the coding method or the audio signal to select the high frequency bandwidth extension mode encoding an audio signal, wherein the bandwidth extension mode and the coding mode or the low frequency corresponding to the selected audio signal, belong to the same domain Encoding.

[0040] 一个实施例中,所选择的带宽扩展模式与低频编码方式对应:当低频音频信号采用时域编码方式时,选择时域带宽扩展模式对高频音频信号进行时域编码;当低频音频信号采用频域编码方式,选择频域带宽扩展模式对高频音频信号进行频域编码。 [0040] In one embodiment, the selected mode and the low-frequency bandwidth extension encoding systems: low-frequency audio signal when the time-domain coding mode, select the high-frequency-domain bandwidth extension mode encoding a time domain audio signal; when the low frequency audio signal frequency domain encoding, frequency domain bandwidth extension mode selected high frequency audio signal frequency domain coding. 即:高频音频信号的编码方式与低频编码方式属于同一个域编码方式(时域编码或者频域编码)。 Namely: encoding low-frequency audio signal with a coding scheme belong to the same domain coding mode (time domain encoding or frequency domain coding).

[0041] 另一个实施例中,与音频信号特征适合的低频编码方式对应:当音频信号为语音信号时,选择时域带宽扩展模式对高频音频信号进行时域编码;当音频信号为音乐信号时,选择频域带宽扩展模式对高频音频信号进行频域编码。 [0041] In another embodiment, the audio signal characteristics for a low frequency encoding systems: when the audio signal is a voice signal, selecting a time-domain high-frequency bandwidth extension mode encoding a time domain audio signal; when the audio signal is a music signal when selecting the frequency-domain bandwidth extension mode frequency audio signal frequency domain coding. 即:高频音频信号的编码方式与音频信号特征适合的低频编码方式属于同一个域编码方式(时域编码或者频域编码)。 Namely: encoding high-frequency audio signal and the audio characteristic signal encoding method for a low frequency belonging to (time domain encoding or frequency domain coding) encoding the same domain.

[0042] 另一个实施例中,综合考虑低频编码方式和音频信号的特征,选择带宽扩展模式对高频音频信号编码:当低频音频信号为时域编码方式,且音频信号为语音信号时,选择时域带宽扩展模式对高频音频信号进行时域编码;否则选择频域带宽扩展模式对高频音频信号进行频域编码。 [0042] In another embodiment, considering the characteristics and the low frequency audio signal encoding method, high-frequency bandwidth extension is selected on the audio signal coding mode: when the low-frequency audio signal into a time domain coding mode, and the audio signal is a speech signal, select when the frequency-domain bandwidth extension mode encoding a time domain audio signal; otherwise selecting the frequency-domain bandwidth extension mode frequency audio signal frequency domain coding.

[0043] 参见图4的本发明实施例音频信号编码方法的带宽扩展示意图之一所示,低频音频信号,例如0-6.4kHz的音频信号可能是时域编码TD coding或者频域编码FD coding,而高频音频信号,例如6.4-16/14kHz的音频信号的带宽扩展可能是时域带宽扩展TD-BWE或者频域带宽扩展FD-BWE。 Example bandwidth of the audio signal encoding method embodiment [0043] Referring to FIG. 4 of the present invention is shown in expanded, schematic view of one low-frequency audio signal, such as an audio signal may be 0-6.4kHz time domain encoding or frequency domain encoding TD coding FD coding, high frequency audio signal, the bandwidth extended audio signal, e.g. 6.4-16 / 14kHz may be a time domain or TD-BWE bandwidth extension frequency-domain bandwidth extension FD-BWE.

[0044] 也就是说本发明实施例的音频信号编码方法中,低频音频信号的编码方式与高频信号的带快扩展之间没有一一对应的关系。 [0044] That audio signal encoding method embodiment of the present invention, with no one correspondence between the high-frequency signal encoding low-frequency audio signal spreading fast. 例如,如果低频音频信号是时域编码TDcoding,其高频音频信号的带宽扩展既可能是时域带宽扩展TD-BWE,也可能是频域带宽扩展FD-BWE ;而如果低频音频信号是频域编码FDcoding,其高频音频信号的带宽扩展同样可能是时域带宽扩展TD-BWE,也可能是频域带宽扩展FD-BWE。 For example, if the low-frequency audio signal is a time domain coding TDcoding, high-frequency bandwidth extension of the audio signal may be either time-domain bandwidth extension TD-BWE, it may be a frequency domain bandwidth extension FD-BWE; and if a low-frequency audio signal is a frequency-domain encoding FDcoding, high-frequency bandwidth extension of the audio signal may also be time-domain bandwidth extension TD-BWE, it may be a frequency domain bandwidth extension FD-BWE.

[0045] 具体的,一种选择带宽扩展模式对高频音频信号编码的方式是根据低频音频信号的低频编码方式进行处理,一并参见图5的本发明实施例音频信号编码方法的带宽扩展示意图之二所示,低频(0-6.4kHz)音频信号是时域编码TD coding时,高频¢.4_16/14kHz)音频信号同样也是时域带宽扩展TD-BWE的时域编码;低频(0-6.4kHz)音频信号是频域编码FD coding时,高频(6.4-16/14kHz)音频信号同样也是频域带宽扩展FD-BWE的频域编码。 [0045] Specifically, an alternative mode of the high-frequency bandwidth extension coding the audio signal processing according to the embodiment is a low frequency encoding low-frequency audio signal, the bandwidth extended audio signal encoding method embodiment schematic view of the embodiment of the present invention collectively refer to FIG. 5 bis shown, low frequency (0-6.4kHz) audio signal is a time domain coding TD coding, frequency ¢ .4_16 / 14kHz) is also a time domain audio signal TD-BWE bandwidth extension encoding a time domain; low (0- 6.4kHz) is a frequency-domain audio signal coding FD coding, high-frequency (6.4-16 / 14kHz) audio signal is also frequency-domain coding the frequency domain FD-BWE of bandwidth extension.

[0046] 所以高频音频信号编码的方式与低频音频信号的编码方式是属于相同域的,而不参考音频信号/低音音频信号的特征,也就是说高频音频信号的编码参照低频音频信号编码的方式进行处理的,与音频信号/低音音频信号的特征无关。 [0046] Therefore, the high-frequency audio signal coding method and coding method is the low frequency audio signal belonging to the same domain, without reference to the characteristics of the audio signal / bass audio signal, the audio signal that is coded with reference to low-frequency audio signal coding processing manner, regardless of the characteristics of the audio signal / bass audio signal.

[0047] 因此,根据低频信号的编码方式来确定高频音频信号带宽扩展的编码方式,避免带宽扩展时不考虑低频音频信号的编码方式,弥补带宽扩展对不同音频信号编码质量的局限性,实现自适应的编码,优化音频编码质量。 [0047] Thus, the low frequency signal according to an encoding of the audio signal to determine the frequency bandwidth extension encoding, the encoding mode considering avoid low-frequency audio signal, to compensate for the limitations of the bandwidth extension signal encoding different audio quality bandwidth extension, to achieve adaptive coding, audio coding quality optimization.

[0048] 另外一种选择带宽扩展模式对高频音频信号编码的方式,是根据音频信号或者低频音频信号的特征来处理。 [0048] Alternatively a high frequency bandwidth extension mode of an audio signal coding method, is processed according to the characteristic low frequency audio signal or an audio signal. 例如如果音频信号/低频音频信号是语音音频信号,则利用时域编码对高频音频信号进行编码,而如果音频信号/低频音频信号是音乐音频信号,则利用频域编码对高频音频信号进行编码。 For example if the audio signal / low frequency audio signal is a speech like audio signal, the high-frequency audio signal is encoded using a time domain coding, and if the audio signal / low frequency audio signal is a music audio signal, using the frequency domain coding the high frequency audio signal coding.

[0049] 同时参见图4所示,高频音频信号带宽扩展的编码只参考音频信号/低音音频信号的特征,而无论低频音频信号的编码方式,所以低频音频信号是时域编码时,高频音频信号可能是时域编码也可能是频域编码,而低频音频信号是频域编码时,高频音频信号可能是频域编码也可能是时域编码。 [0049] Referring to FIG. 4, a high-frequency bandwidth extension coding the audio signal with reference to only the audio characteristic signal / bass audio signal, whether encoding low-frequency audio signal, the low frequency audio signal is a time domain encoding, frequency is a time domain audio signal may also be encoded in the frequency domain encoding, and the low frequency audio signal is a frequency-domain encoding, frequency audio signal may be encoded in the frequency domain may be time domain coding.

[0050] 因此,根据音频信号/低频信号的特点来确定高频音频信号带宽扩展的编码方式,避免带宽扩展时不考虑音频信号/低频音频信号的特点,弥补带宽扩展对不同音频信号编码质量的局限性,实现自适应的编码,优化音频编码质量。 [0050] Thus, according to the characteristics of the audio signal / low frequency signal to determine high frequency audio signal bandwidth extension encoding, avoid considering the characteristics of the audio signal / audio signal when the low frequency bandwidth extension, bandwidth extension to compensate for different quality audio signal coding limitation, adaptive coding, audio coding quality optimization.

[0051] 再有一种选择带宽扩展模式对高频音频信号编码的方式,既要根据低频音频信号的编码方式也要根据音频信号/低频音频信号的特征。 [0051] Note that an alternative mode of the high-frequency bandwidth extension of the audio signal coding method, both according to an encoding low-frequency audio signal but also an audio signal according to the characteristic / low-frequency audio signal. 例如当低频音频信号为时域编码方式,而且音频信号/低频音频信号为语音信号时,选择时域带宽扩展模式对高频音频信号进行时域编码;而当低频音频信号为频域编码方式,或者低频音频信号为时域编码方式,且音频信号/低频音频信号为音乐信号时,选择频域带宽扩展模式对高频音频信号进行频域编码。 For example, when low-frequency audio signal into a time domain coding scheme and an audio signal / audio signal is a low frequency speech signal to select a time-domain frequency bandwidth extension mode encoding the time-domain audio signal; and when the low frequency audio signal into a frequency domain coding mode, or low-frequency audio signal into a time domain coding scheme and an audio signal / low frequency audio signal is a music signal, the frequency-domain bandwidth extension mode to select the high-frequency audio signal frequency domain coding.

[0052] 图6为本发明实施例音频信号编码方法的带宽扩展示意图之三,如图所示,当低频(6.4-16/14kHz)音频信号为时域编码TD coding时,高频(6.4_16/14kHz)音频信号可以是频域带宽扩展FD-BWE的频域编码,也可以是时域带宽扩展TD-BWE的时域编码;而当低频(6.4-16/14kHz)音频信号为频域编码FDcoding时,高频(6.4-16/14kHz)音频信号同样是频域带宽扩展FD-BWE的频域编码。 [0052] Fig 6 a schematic view of three of the bandwidth extended audio signal encoding method embodiment of the embodiment of the present invention, as illustrated, when the low frequency (6.4-16 / 14kHz) encoding a time domain audio signal TD coding, frequency (6.4_16 / 14kHz) audio signal may be frequency-domain coding the frequency domain FD-BWE bandwidth extension may also be time-domain bandwidth extension TD-BWE encoding a time domain; and when the low frequency (6.4-16 / 14kHz) into a frequency domain encoded audio signal FDcoding, the high-frequency (6.4-16 / 14kHz) frequency domain audio signal is also encoded in the frequency domain FD-BWE of bandwidth extension.

[0053] 因此,根据低频信号的编码模式和音频信号/低频信号的特点来确定高频音频信号带宽扩展的编码方式,避免带宽扩展时不考虑低频信号的编码模式和音频信号/低频音频信号的特点,弥补带宽扩展对不同音频信号编码质量的局限性,实现自适应的编码,优化音频编码质量。 [0053] Thus, the coding mode according to the characteristics of the low frequency signal and an audio signal / low frequency signal to determine high frequency audio signal bandwidth extension encoding, the encoding mode considering avoid low frequency signal and the audio signal / audio signal of the low-frequency bandwidth extension characteristics, to compensate for the limitations of the bandwidth extension signal encoding different audio quality, adaptive coding, audio coding quality optimization.

[0054] 本发明实施例音频信号的编码方法中对于低频音频信号的编码方式可以是时域编码或者频域编码,而带宽扩展方法也是两种,时域带宽扩展和频域带宽扩展,可以对应不同的低频带编码方式。 [0054] The embodiment of the present invention, an audio signal encoding method for encoding the low frequency audio signal may be a time domain encoding or frequency domain encoding, and the bandwidth extension methods are also two types of time domain and frequency domain bandwidth expansion bandwidth extension, may correspond encoding the low frequency band.

[0055] 时域带宽扩展和频域带宽扩展有可能延时不同,所以需要延时对齐,以达到统一的延时。 [0055] The time domain and frequency domain bandwidth expansion bandwidth extension possible different delays, delay alignment is required in order to achieve a uniform delay.

[0056] 假设所有低频音频信号编码延时相同,这样时域带宽扩展和频域带宽扩展的延时最好也相同,通常时域带宽扩展的延时是固定的,而频域带宽扩展的延时是可调的,所以可以通过调整频域带宽扩展的延时来实现延时统一。 [0056] Assuming all the same low-frequency audio signal coding delay, so that the time domain and frequency domain bandwidth expansion bandwidth expansion is also preferably the same delay, the normal time-domain bandwidth extension delay is fixed, the frequency domain bandwidth expansion extension when it is adjustable, so it can be achieved by adjusting the delay unified frequency-domain bandwidth expansion delay.

[0057] 本发明实施例可以实现相对于解码低频信号的零延时带宽扩展,此处零延时是相对于低频带而言,因为非对称窗本身是有延时的。 Example [0057] The present invention may be implemented with respect to the zero delay decoding bandwidth extension of the low frequency signal, where the delay is zero with respect to a low frequency band, the window itself is asymmetric because there is a delay. 而且本发明实施例可以对高频带信号进行不同的加窗,此处采用的是非对称的窗,如图7所示的ITU-T G.718中的分析窗。 Further embodiments of the present invention may be different windowing high frequency band signal, the analysis window is asymmetric window employed herein, as shown in FIG. 7 ITU-T G.718. 而且可以实现从相对于解码低频信号的零延时到相对于解码低频信号的高频窗自身延时之间的任一延时,如图8所示。 And can be achieved from the decoded low frequency signal to the Renyi Yan zero delay between the decoded low frequency signal is delayed with respect to the high frequency window itself, with respect to FIG. 8.

[0058] 图8为本发明音频信号编码方法的不同高频音频信号的加窗示意图,如图所示,对于不同中贞(frame),例如对于(m_l)巾贞frame、(m)巾贞frame和(m+1)中贞frame,可以实现高频信号高延时窗(High delay windowing)、高频信号低延时窗(Low delay windowing)和高频信号零延时窗(Zero delaywindowing)。 Windowing a schematic view of different high frequency audio signals [0058] FIG 8 audio signal encoding method of the present invention, as shown, in different Chen (Frame), for example (M_L) Chen towel frame, (m) towel Zhen frame and the (m + 1) in Chen frame, can realize a high-frequency signal delay window (high delay windowing), a low frequency signal delay window (low delay windowing) and high frequency signals zero delay window (zero delaywindowing). 这里高频信号各延时窗并没有考虑窗本身的延时,只是考虑不同的高频信号的加窗方式。 Here the high-frequency signal of each delay window and does not consider the delay window itself, considered only windowed high-frequency signal in different ways.

[0059] 图9为本发明音频信号编码方法中高频信号高延时窗的BWE示意图,如图所示,当输入帧的低频音频信号完全解码后,用解码后的低频音频信号作为高频激励信号,输入帧高频音频信号的加窗是根据输入帧低频音频信号解码的延时来确定。 [0059] FIG. 9 BWE audio signal encoding method in a schematic view of a high frequency signal of the present invention, the high latency window, as shown, the low-frequency audio signal when the input frame is completely decoded, with the decoded low-band audio signal as a high frequency excitation signal, windowed input frame frequency of the audio signal is determined according to the input low frequency audio signal decoding frame delay.

[0060] 例如,编解码的低频音频信号延时为Dims,在编码端编码器Encoder对高频音频信号进行时频变换时,将延时Dims的高频音频信号进行时频变换,而高频音频信号的加窗变换会产生D2毫秒的延时,所以在解码端解码器Decoder解码的高频带信号的总延时为D1+D2毫秒;这样相对解码的低频音频信号,高频音频信号有额外D2毫秒延时,即解码的低频音频信号需要额外延时D2毫秒和解码的高频音频信号对齐,输出信号总延时为D1+D2。 [0060] For example, the low-band audio signal encoding and decoding delay is Dims, time-frequency transform at the time of encoding of the encoder Encoder high frequency audio signal, the delayed high-frequency audio signal Dims performs frequency transform and the high windowed transform audio signal D2 milliseconds is generated, so the total delay in the high frequency band decoded signal decoder decoder is a decoder D1 + D2 msec; so that the relatively low frequency decoded audio signal, the audio signal has a high frequency additional ms delay D2, i.e., the decoded low frequency audio signal requires extra latency ms and D2 decoded high-band audio signal alignment, the output signal total delay D1 + D2. 而在解码端,因为高频激励信号需要从低频音频信号的预测中得到,所以对解码端的低频音频信号和编码端的高频音频信号来说,均做同样的时频变换处理,而由于编码端的高频音频信号和解码端的低频音频信号都是对延时Dl毫秒后的音频信号做时频变换,因此激励信号是对齐的。 In the decoding end, since the high-frequency excitation signal needs to be obtained from the predicted low frequency audio signal, the high frequency audio signal is low-band audio signal and the encoded decoding end side, the both the same do-frequency conversion, and as the encoding side frequency transform an audio signal and a high-frequency low-band audio decoding end signal to the audio signal is delayed Dl ms do so the excitation signal are aligned.

[0061] 图10为本发明首频彳目号编码方法中闻频彳目号零延时窗BWE 意图,如图所75,是编码端对当前接收的帧的高频音频信号直接进行加窗,解码端时频变换处理用当前帧解码的低频音频信号作为激励信号,虽然激励信号可能会有一定错位,但是经过对激励信号进行修正,错位的影响可以忽略不计。 [0061] FIG. 10 is the first coding method of frequency resolution mesh left foot invention smell left foot mesh frequency number zero delay window BWE intended, as shown in FIG 75, the high frequency end of the audio coded signal of the frame currently received directly windowing frequency conversion processing with the current frame decoded low frequency audio signal as the excitation signal, an excitation signal, although there may be some misalignment when the decoding end, but after correcting the excitation signal, the influence of misalignment is negligible.

[0062] 例如,解码的低频带信号延时为Dl毫秒,而编码端对高频带信号做时频变换时不做延时处理,而只是由于高频信号加窗变换会产生D2毫秒的延时,所以在解码端解码的高频带信号的总延时为D2毫秒。 [0062] For example, the decoded low band signal Dl delay of milliseconds, while the time of encoding of the high frequency band signal terminal do not delay the frequency conversion process, but only due to the high frequency signal generated windowed transform millisecond delay D2 when, so the total delay in the decoding of the decoder for the high frequency band signal D2 milliseconds.

[0063] 当Dl等于D2时,解码的低频音频信号不需要额外延时即能和解码的高频音频信号对齐;但在解码端预测高频带激励信号是从对延时Dl毫秒后的低频音频信号做时频变换得到的频域信号中得到的,所以,高频激励信号和低频激励信号没有对齐,具有Dl毫秒的错位。 [0063] When D2 is equal to Dl, the decoded low frequency audio signal does not need additional delay that can aligned and the decoded high-band audio signal; predictive decoding side, but a high frequency band excitation signal from low frequency to the delay Dl ms frequency domain signal obtained by converting the audio frequency signal obtained by doing so, the high-frequency excitation signal and the low frequency excitation signals are not aligned, offset with Dl milliseconds. 解码信号相对于编码端信号总体延时是Dl或者D2。 Encoding the decoded signal with respect to the overall end signal is delayed Dl or D2.

[0064] 当Dl不等于D2时,例如Dl小于D2时,解码信号相对于编码端信号总体延时是D2毫秒,高频激励信号和低频激励信号之间的错位是Dl毫秒,解码的低频音频信号需要额外延时(D2-D1)毫秒和解码的高频音频信号对齐。 [0064] When Dl D2 are not equal, for example, less than Dl D2, with respect to the decoded signal of an encoder signal D2 is generally millisecond delay, and low-frequency excitation signal excitation signal is a misalignment between Dl msec, the decoded low-band audio require extra latency signal (D2-D1) milliseconds and decoded high-band audio signal are aligned. 如Dl大于D2时,这样解码信号相对于编码端信号总体延时是Dl毫秒,高频激励信号和低频激励信号之间的错位是Dl毫秒,解码的高频音频信号需要额外延时(D1-D2)毫秒和解码的低频音频信号对齐。 The time is greater than Dl D2, so that the decoded signal with respect to the overall delay is an encoder signal Dl msec, high-frequency excitation signal and the low frequency excitation signal is a misalignment between Dl msec, the decoded high-band audio signal requires additional latency (D1- D2) ms and the low frequency audio signal decoding aligned.

[0065] 介于如上高频信号零延时窗和高延时窗之间的BWE,是编码端对当前接收的帧的高频音频信号延时D3毫秒后进行加窗,该延时介于O和Dl毫秒之间,解码端时频变换处理用低频音频信号当前帧解码信号作为激励信号,虽然激励信号可能会有一定错位,但是经过对激励信号进行修正,错位的影响可以忽略不计。 [0065] The BWE interposed between the high-frequency signal as high latency zero-delay window and the window, the windowing is performed after the end of the high-frequency encoded audio signal currently received frame delay D3 milliseconds, and the delay between O Dl between milliseconds, the decoding of the frequency conversion processing with a low frequency signal of the current frame decoded audio signal as an excitation signal, although there may be some misalignment excitation signals, but the excitation signal after the correction, the influence of misalignment is negligible.

[0066] 当Dl等于D2时,解码的低频音频信号需要额外延时D3毫秒和解码的高频音频信号对齐;但在解码端预测高频带激励信号是从对延时Dl毫秒后的低频音频信号做时频变换得到的频域信号中得到的,所以,高频激励信号和低频激励信号没有对齐,具有(D1-D3)毫秒的错位。 [0066] When D2 is equal to Dl, the decoded low frequency audio signal D3 ms and requires extra latency decoded high-band audio signal alignment; however, the prediction at the decoder highband excitation signal from the low frequency audio millisecond delay Dl of frequency-domain signal obtained when the frequency signal obtained in doing so, the high-frequency excitation signal and the low frequency excitation signal is not aligned with (D1-D3) milliseconds offset. 解码信号相对于编码端信号总体延时是(D2+D3)或者(D1+D3)毫秒。 A decoded signal with respect to the overall delay is an encoder signal (D2 + D3) or (D1 + D3) milliseconds.

[0067] 当Dl不等于D2时,例如Dl小于D2时,解码信号相对于编码端信号总体延时是(D2+D3)毫秒,高频激励信号和低频激励信号之间的错位是(D1-D3)毫秒,解码的低频音频信号需要额外延时(D2+D3-D1)毫秒和解码的高频音频信号对齐。 [0067] When Dl D2 are not equal, for example, less than Dl D2, the decoded signal with respect to the overall delay is an encoder signal (D2 + D3) of milliseconds, and the low frequency excitation signal excitation signal is a misalignment between the (D1- D3) msec, the decoded low-band audio signal requires extra latency (D2 + D3-D1) milliseconds and decoded high-band audio signal are aligned.

[0068] 如Dl大于D2时,这样解码信号相对于编码端信号总体延时是max (Dl, D2+D3)毫秒,高频激励信号和低频激励信号之间的错位是(D1-D3)毫秒,其中max(a,b)表示取a和b的较大的一个值。 [0068] The time is greater than Dl D2, so that the decoded signal with respect to the overall signal delay is an encoder max (Dl, D2 + D3) of milliseconds, and the low frequency excitation signal excitation signal is a misalignment between the (D1-D3) ms where max (a, b) represents taking a larger value of a and b. 当max(Dl,D2+D3) = D2+D3时,解码的低频音频信号需要额外延时(D2+D3-D1)毫秒和解码的高频音频信号对齐,当max(Dl,D2+D3) = Dl时,解码的高频音频信号需要额外延时(D1-D2-D3)毫秒和解码的低频音频信号对齐;举一特例,当D3 =(D1-D2)毫秒,这样解码信号相对于编码端信号总体延时是Dl毫秒,高频激励信号和低频激励信号之间的错位是D2毫秒,此时解码的低频音频信号不需要额外延时即能和解码的高频音频信号对齐。 When max (Dl, D2 + D3) = D2 + D3, the decoded low frequency audio signal requires additional delay (D2 + D3-D1) milliseconds and decoded high-band audio signal are aligned, when max (Dl, D2 + D3) when = Dl, decoded high-band audio signal requires additional delay (D1-D2-D3) ms and the low frequency audio signal decoding aligned; for a special case, when D3 = (D1-D2) msec, so that the decoded signal with respect to the encoded the overall delay is ended signal Dl ms, the misalignment between the excitation frequency and the low frequency excitation signal D2 is milliseconds, then the decoded low-band audio signal does not need additional delay that can aligned and decoded high-band audio signal.

[0069] 所以,本发明实施例在时域带宽扩展中需要对频域带宽扩展的状态保持更新,因为下一帧有可能是频域带宽扩展,同理在频域带宽扩展中需要对时域带宽扩展的状态保持更新,因为到下一帧有可能是时域带宽扩展,由此通过这种方法来实现带宽切换的连续性。 [0069] Therefore, embodiments of the present invention the frequency domain bandwidth expansion required for maintaining the state of bandwidth extension in the time domain updates, the next frame because there may be a frequency domain bandwidth expansion, the need for the same reason in the frequency domain bandwidth of a time domain extension state maintaining updated bandwidth expansion, as the next frame is likely to be a time-domain bandwidth extension, thereby to achieve continuity bandwidth switching by this method.

[0070] 以上实施例是对于本发明音频信号编码方法的,同样,可以利用音频信号处理装置来实现。 Example [0070] The above is for an audio signal encoding method of the present invention, likewise, may be implemented using an audio signal processing apparatus. 图11为本发明实施例音频信号处理装置的示意图,如图所示,本发明实施例信号处理装置具体包括:划分单元11、低频信号编码单元12和高频信号编码单元13。 FIG 11 is a schematic diagram of an audio signal processing apparatus embodiment, shown in FIG present invention, the embodiment of the present invention a signal processing apparatus comprises: a dividing unit 11, coding unit 12 a low frequency signal and the high frequency signal encoding unit 13.

[0071] 划分单元11用于将音频信号分为高频音频信号和低频音频信号;低频信号编码单元12用于根据低频音频信号的特征对所述低频音频信号利用相应的低频编码方式编码;而编码方式可以是时域编码或频域编码方式,例如对于语音音频信号,利用时域编码对低频语音信号进行编码,而对于音乐音频信号,利用频域编码对低频音乐信号进行编码。 [0071] The means 11 for dividing the audio signal into low frequency audio signal and an audio signal; a low frequency signal coding unit 12 for coding the corresponding low frequency encoded using the low frequency audio signal according to the characteristics of the low-frequency audio signal; and coding mode may be time domain encoding or frequency domain encoding, for example, an audio speech signal, by using time domain coding the low frequency speech signal is encoded, and for the music audio signal, low frequency using a frequency domain coding music signal is encoded. 因为通常来讲说语音信号采用时域编码的效果比较好,而音乐信号采用频域编码的效果比较好。 Because generally speaking, said speech signals using time domain coding results were better, and the music signal frequency domain coding results were better.

[0072] 高频信号编码单元13用于根据所述低频编码方式和/或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码。 [0072] the high frequency signal according to the characteristic coding means 13 for coding the low frequency and / or the audio signal, the mode selection frequency bandwidth extension coding the audio signal.

[0073] 具体的,如果低频信号编码单元12采用时域编码,则高频信号编码单元13选择时域带宽扩展模式对所述高频音频信号进行时域或频域编码;而如果低频信号编码单元12采用频域编码,则高频信号编码单元13选择频域带宽扩展模式对所述高频音频信号进行时域或频域编码。 [0073] Specifically, if the low frequency signal encoding unit 12 using a time domain coding, when the coding unit 13 selects the high frequency domain signal bandwidth extension mode the high frequency audio signal in time domain or frequency domain encoding; encoding if the low frequency signal frequency-domain coding unit 12, the high-frequency signal encoding unit 13 selects the frequency-domain bandwidth extension mode, the high frequency audio signal in the time domain or frequency domain coding.

[0074] 另外,如果音频信号/低频音频信号是语音音频信号,则高频信号编码单元13利用时域编码对高频频语音信号进行编码,而如果音频信号/低频音频信号是音乐音频信号,则高频信号编码单元13利用频域编码对高频频音乐信号进行编码。 [0074] Further, if the audio signal / low frequency audio signal is a speech like audio signal, the high frequency signal using time domain encoding unit 13 encodes the high-frequency speech signal is encoded, and if the audio signal / low frequency audio signal is a music audio signal, a high frequency signal encoding unit 13 encodes the high frequency signal using a music frequency domain coding. 此时不考虑低频音频信号的编码模式。 At this time, without regard to the low-frequency audio signal coding mode.

[0075] 再有,当低频信号编码单元12对低频音频信号采用时域编码方式,而且音频信号/低频音频信号为语音信号时,高频信号编码单元13选择时域带宽扩展模式对高频音频信号进行时域编码;而当低频信号编码单元12对低频音频信号采用频域编码方式,或者低频信号编码单元12对低频音频信号采用时域编码方式,且音频信号/低频音频信号为音乐信号时,选择频域带宽扩展模式对高频音频信号进行频域编码。 [0075] Further, when the low frequency signal coding unit 12 to low-frequency audio signal using a time-domain coding mode, and the audio signal / audio signal is a low frequency speech signal when the encoding unit 13 selects a high frequency signal of the frequency domain audio bandwidth extension mode signal time domain coding; and when the low frequency signal coding unit 12 a low-frequency audio signal frequency domain coding mode or a frequency signal coding unit 12 a low-frequency audio signal using time domain coding mode, and the audio signal / low frequency audio signal is a music signal selecting the frequency-domain bandwidth extension mode frequency audio signal frequency domain coding.

[0076] 图12为本发明实施例另一音频信号处理装置的示意图,如图所示,本发明实施例信号处理装置还具体包括:低频信号解码单元14。 [0076] FIG. 12 is a schematic of another embodiment of an audio signal processing apparatus of the embodiment of the present invention, as shown, the signal processing apparatus according to embodiments of the present invention further comprises: a low-frequency signal decoding unit 14.

[0077] 低频信号解码单元14用于对低频音频信号解码;低频音频信号编解码产生第一延时D1。 [0077] The low-frequency signal decoder 14 for decoding the low-frequency audio signal; a low-frequency audio codec generating a first delay signal D1.

[0078] 具体的,如果高频音频信号有延时窗时,高频信号编码单元13用于对高频音频信号进行第一延时Dl后编码,高频音频信号编码产生第二延时D2 ;使得音频信号编解码延时是第一延时Dl和第二延时D2之和(D1+D2)。 [0078] Specifically, if the high-band audio signal with a delay of a window, a high frequency signal encoding unit 13 for high-frequency audio signal after a first delay Dl encoded, generating a second high frequency audio signal encoding delay D2 ; that the audio codec delay is a first delay and a second delay Dl and D2 sum (D1 + D2).

[0079] 如果高频音频信号没有延时窗时,高频信号编码单元13用于对高频音频信号编码,高频音频信号编码产生第二延时D2 ;当第一延时Dl小于等于第二延时D2时,低频信号编码单元12对低频音频信号编码后延时第二延时D2与第一延时Dl之差(D2-D1),使得音频信号编解码延时是第二延时D2 ;当第一延时Dl大于第二延时D2时,低频信号编码单元12对高频音频信号对高频音频信号编码后延时第一延时Dl与第二延时D2之差(D1-D2);使得音频信号编解码延时是第一延时Dl。 [0079] If the high-frequency audio signal is no delay window, a high frequency signal encoding unit 13 for generating a second delay signal D2 of the high-frequency audio coding, the high-frequency audio signal coding; Dl when the first delay is less than equal to the two delay D2, the low-frequency audio signal coding unit 12 pairs of the low frequency signal encoding delay time difference D2 of the second delay Dl of the first delay (D2-D1), so that the audio signal delay is a second delay codecs D2; Dl when the first delay is greater than the second delay D2, the low frequency signal coding unit 12 of the high-frequency audio signal after the high-band audio signal encoding delay difference between the first delay Dl and D2 of the second delay (D1 -D2); that the audio codec delay is a first delay Dl.

[0080] 如果高频音频信号为中间延时窗时,高频信号编码单元13用于对高频音频信号进行第三延时D3后编码,高频音频信号编码产生第二延时D2 ;当第一时延小于等于第二时延时,低频信号编码单元12对低频音频信号编码后延时第二延时D2和第三延时D3与第一延时Dl之差(D2+D3-D1),使得音频信号编解码延时是第二延时D2和第三延时D3之和(D2+D3);当第一时延大于第二时延时,具有两种可能性,如果第一延时Dl大于等于第二延时D2和第三延时D3之和(D2+D3),高频信号编码单元13对高频音频信号编码后延时第一延时Dl与第二延时D2、第三延时D3和之差(D1-D2-D3),如果第一延时Dl小于第二延时D2和第三延时D3之和(D2+D3),低频信号编码单元12对低频音频信号编码后延时第二延时D2加第三延时D3与第一延时Dl之差(D2+D3-D1),使得音频信号编解码延时是第一延时Dl或第二延时D2和第三延 [0080] If the high-frequency audio signal into intermediate delay window, a high frequency signal encoding unit 13 for high-frequency audio signal after a third delay D3 encoded, generating a second high frequency audio signal encoding D2 of delay; when the first delay is less than equal to the second time delay, low delay differential signal encoding unit D2 and D3 and the third delay Dl of the first delay of the second delay after the 12 pairs encoding low-frequency audio signal (D2 + D3-D1 ), such that the audio codec delay is a second delay D2 and D3 of the third delay and (D2 + D3); when the first delay is greater than a second delay time, with two possibilities, if the first a second delay equal to the delay Dl is greater than D2, and D3 of the third delay and (D2 + D3), the high-frequency signal encoding unit 13 pairs of high-frequency audio signal coding delay of the first delay and the second delay Dl D2 , D3 and third delay difference (D1-D2-D3), if the first delay is less than the second delay Dl D2 D3 and the third delay and sum (D2 + D3), the low frequency low-frequency signal encoding unit 12 the difference between the second audio signal coding delay plus the delay D2 D3 third delay Dl of the first delay (D2 + D3-D1), so that the audio codec is the delay of the first delay or the second delay Dl when D2 and the third extension D3之和(D2+D3)。 D3 sum (D2 + D3).

[0081] 因此,本发明实施例音频信号编码装置可以根据低频信号的编码模式和/或音频信号/低频信号的特点来确定高频音频信号带宽扩展的编码方式,避免带宽扩展时不考虑低频信号的编码模式和音频信号/低频音频信号的特点,弥补带宽扩展对不同音频信号编码质量的局限性,实现自适应的编码,优化音频编码质量。 [0081] Thus, cases of audio signal coding apparatus embodiment of the present invention may be determined in a high-frequency bandwidth extension of the audio signal coding scheme encoding mode according to the characteristics of the low frequency signal and / or audio signal / low frequency signal, avoiding the low frequency signal irrespective bandwidth extension characteristic and the audio signal coding mode / low frequency audio signal, to compensate for the limitations of the bandwidth extension signal encoding different audio quality, adaptive coding, audio coding quality optimization.

[0082] 专业人员应该还可以进一步意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、计算机软件或者二者的结合来实现,为了清楚地说明硬件和软件的可互换性,在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。 [0082] professionals should also be further appreciated that, as disclosed herein in conjunction with units and algorithm steps described exemplary embodiments, by electronic hardware, computer software, or a combination thereof. In order to clearly illustrate hardware and software interchangeability, in the above description, according to functions generally described compositions and steps of the examples. 这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。 Whether these functions are performed by hardware or software depends upon the particular application and design constraints of the technical solutions. 专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本发明的范围。 Professional technical staff may use different methods for each specific application to implement the described functionality, but such implementation should not be considered outside the scope of the present invention.

[0083] 结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、处理器执行的软件模块,或者二者的结合来实施。 [0083] The steps of a method or algorithm described in the embodiments disclosed herein may be implemented in hardware, or a combination thereof, in a software module executed by a processor to implement. 软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。 A software module may be placed in a random access memory (RAM), a memory, a read only memory (ROM), electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, CD-ROM, or within the technical field known any other form of storage medium.

[0084] 以上所述的具体实施方式,对本发明的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上所述仅为本发明的具体实施方式而已,并不用于限定本发明的保护范围,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 [0084] The foregoing specific embodiments, objectives, technical solutions, and advantages of the invention will be further described in detail, it should be understood that the above descriptions are merely specific embodiments of the present invention, but not intended to limit the scope of the present invention, all within the spirit and principle of the present invention, any changes made, equivalent substitutions and improvements should be included within the scope of the present invention.

Claims (14)

  1. 1.一种音频信号编码方法,其特征在于,所述方法包括: 将音频信号分为高频音频信号和低频音频信号; 根据低频音频信号的特征利用时域编码或频域编码方式对所述低频音频信号编码; 根据所述低频音频信号的时域编码方式或频域编码方式,或者根据所述音频信号为语音信号或者音乐信号,选择时域带宽扩展模式或者频域带宽扩展模式对所述高频音频信号进行编码。 An audio signal encoding method, characterized in that the method comprises: the audio frequency signal into a low frequency audio signal and an audio signal; a low frequency audio signal by using the feature of the time domain encoding or frequency domain encoding the encoding low-frequency audio signal; time-domain coding mode or a frequency-domain coding mode of the low frequency audio signal or the audio signal according to a speech signal or a music signal, selecting the time domain mode or the frequency-domain bandwidth extension mode the bandwidth extension encoding high-frequency audio signal.
  2. 2.根据权利要求1所述的音频信号编码方法,其特征在于,所述根据所述低频编码方式,选择带宽扩展模式对所述高频音频信号编码具体为,根据所述低频音频信号的时域编码方式,选择时域带宽扩展模式对所述高频音频信号进行时域编码;或根据所述低频音频信号的频域编码方式,选择频域带宽扩展模式对所述高频音频信号进行频域编码。 The audio signal encoding method according to claim 1, wherein the low frequency encoded according to said mode selection mode the high frequency bandwidth extension coding the audio signal Specifically, when the low frequency audio signal according to domain coding mode, selecting the time domain to the frequency bandwidth extension mode of time-domain encoded audio signal; the frequency domain coding mode or the low-frequency audio signal, the frequency-domain bandwidth extension mode selection of the frequency-high frequency audio signal domain coding.
  3. 3.根据权利要求1所述的音频信号编码方法,其特征在于,所述根据所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码具体为,所述音频信号为语音信号,选择时域带宽扩展模式对所述高频音频信号进行时域编码;所述音频信号为音乐信号,选择频域带宽扩展模式对所述高频音频信号进行频域编码。 The audio signal encoding method according to claim 1, characterized in that, according to the characteristic of the audio signal, the mode selection frequency bandwidth extension coding the audio signal Specifically, the audio signal is a speech signal selecting the time domain to the frequency bandwidth extension mode of time-domain encoded audio signal; the audio signal is a music signal, the frequency-domain bandwidth extension mode to select the high frequency audio signal frequency domain coding.
  4. 4.根据权利要求1所述的音频信号编码方法,其特征在于,所述根据所述低频编码方式和所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码具体为,所述低频音频信号为时域编码方式,且所述音频信号为语音信号,则选择时域带宽扩展模式对所述高频音频信号进行时域编码;否则选择频域带宽扩展模式对所述高频音频信号进行频域编码。 The audio signal encoding method according to claim 1, characterized in that, according to the characteristic of the low frequency signal and said audio coding mode, the selection mode the high frequency bandwidth extension coding the audio signal Specifically, the said low-frequency audio signal into a time domain coding scheme and the audio signal is a speech signal, the time-domain bandwidth extension mode is selected for the high frequency time-domain encoded audio signal; otherwise selecting the frequency domain to the frequency bandwidth extension mode audio signal frequency domain coding.
  5. 5.根据权利要求1所述的音频信号编码方法,其特征在于,所述方法还包括: 对所述低频音频信号解码,所述低频音频信号编解码产生第一延时; 所述对所述高频音频信号编码具体为,对所述高频音频信号编码,所述高频音频信号编码产生第二延时。 The audio signal encoding method according to claim 1, wherein said method further comprises: decoding the low-frequency audio signal, the low frequency audio codec generating a first delay signal; the said encoding high-frequency audio signal specifically, the high frequency encoded audio signal, the encoded audio signal to generate a second high frequency delay.
  6. 6.根据权利要求5所述的音频信号编码方法,其特征在于,所述对所述高频音频信号编码具体为,对所述高频音频信号进行第一延时后编码,使得所述音频信号编解码延时是第一延时和第二延时之和。 The audio signal encoding method according to claim 5, characterized in that, the high frequency of the audio signal coding Specifically, the high-frequency audio signal after a first delay coding, such that the audio cODEC delay is the delay of the first delay and the second sum.
  7. 7.根据权利要求5所述的音频信号编码方法,其特征在于,当所述第一延时小于等于第二延时时,对所述低频音频信号编码后延时第二延时与第一延时之差,使得音频信号编解码延时是第二延时;当所述第一延时大于第二延时时,对所述高频音频信号编码后延时第一延时与第二延时之差;使得音频信号编解码延时是第一延时。 The audio signal encoding method as claimed in claim 5, wherein, when the first delay is less than equal to the second delay after the low frequency audio signal and the first encoded second delay the delay difference, so that the audio codec delay is a second delay; when the first delay is greater than a second delay, after the first high frequency audio signal coding delay and the second delay the delay difference; that the audio codec delay is a first delay.
  8. 8.根据权利要求5所述的音频信号编码方法,其特征在于,所述方法还包括:所述对所述高频音频信号编码具体为,对所述高频音频信号进行第三延时后编码; 当所述第一延时小于等于第二延时时,对所述低频音频信号编码后延时第二延时和第三延时与第一延时之差,使得音频信号编解码延时是第二延时和第三延时之和;当所述第一延时大于第二延时时,对所述高频音频信号编码后延时第一延时与第二延时、第三延时和之差,或者对所述低频音频信号编码后延时第二延时加第三延时与第一延时之差,使得音频信号编解码延时是第一延时或第二延时和第三延时之和。 The audio signal encoding method according to claim 5, characterized in that, said method further comprising: the high frequency of the audio signal coding Specifically, the third high frequency audio signal after delay coding; or less when the second delay, the low-frequency audio signal after encoding the first delay and the second delay difference between the first and third delay of the delay, so that the audio codec delay and the second delay time is the sum of the third delay; when the first delay is greater than a second delay signal after the high frequency audio encoding delay and a second delay delays the first, second and three delay difference, or the second delay plus the delay of the third delay after encoding low-frequency audio signal of the difference between the first delay, such delay audio codec is the first or second delay the third delay and delay sum.
  9. 9.一种音频信号编码装置,其特征在于,所述装置包括: 划分单元,用于将音频信号分为高频音频信号和低频音频信号; 低频信号编码单元,用于根据低频音频信号的特征对所述低频音频信号利用相应的低频编码方式编码; 高频信号编码单元,用于根据所述低频编码方式和/或所述音频信号的特征,选择带宽扩展模式对所述高频音频信号编码。 An audio signal coding apparatus, wherein, said apparatus comprising: a dividing unit for high-frequency audio signal into a low frequency audio signal and an audio signal; a low-frequency signal encoding means for low-frequency audio signal according to characteristic using the low frequency audio signal encoded in the corresponding low frequency; high frequency signal encoding unit for encoding said low frequency characteristic and / or the audio signal to select the high frequency bandwidth extension mode encoding an audio signal .
  10. 10.根据权利要求9所述的音频信号编码装置,其特征在于,所述低频信号编码单元具体用于根据低频音频信号的特征利用时域编码或频域编码方式对所述低频音频信号编码。 10. The audio signal coding apparatus according to claim 9, wherein said low frequency signal encoding unit configured to encode the low-frequency audio signal using time domain encoding or frequency domain encoding according to the characteristic of the low frequency audio signal.
  11. 11.根据权利要求9所述的音频信号编码装置,其特征在于,所述高频信号编码单元具体用于根据所述低频音频信号的时域编码或频域编码方式,选择时域或频域带宽扩展模式对所述高频音频信号进行时域或频域编码。 11. The audio signal coding apparatus according to claim 9, wherein said coding unit is a high frequency signal according to a time domain encoding or frequency domain encoding said low frequency audio signal, selected time or frequency domain bandwidth extension mode, the high frequency audio signal in time domain or frequency domain coding.
  12. 12.根据权利要求9所述的音频信号编码装置,其特征在于,所述音频信号为语音信号时,所述高频信号编码单元具体用于选择时域带宽扩展模式对所述高频音频信号进行时域编码;所述音频信号为音乐信号时,所述高频信号编码单元具体用于选择频域带宽扩展模式对所述高频音频信号进行频域编码。 12. The audio signal coding apparatus according to claim 9, wherein said audio signal is a speech signal, the high frequency signal encoding unit is used for bandwidth extension mode selection field of said high frequency audio signal encoding the time domain; the audio signal is a music signal, the high frequency signal encoding means for selecting a specific frequency-domain frequency bandwidth extension mode, the audio signal frequency domain coding.
  13. 13.根据权利要求9所述的音频信号编码装置,其特征在于,所述低频音频信号为时域编码方式,且所述音频信号为语音信号时,所述高频信号编码单元具体用于选择时域带宽扩展模式对所述高频音频信号进行时域编码,否则选择频域带宽扩展模式对所述高频音频信号进行频域编码。 13. The audio signal coding apparatus according to claim 9, wherein said low-frequency audio signal into a time domain coding scheme and the audio signal is a speech signal, the high frequency signal for selecting a specific coding unit temporal high-frequency bandwidth extension mode of said encoded audio signal in time domain, frequency domain or select the mode of the high frequency bandwidth extension of audio signal frequency domain coding.
  14. 14.根据权利要求9所述的音频信号编码装置,其特征在于,所述装置还包括: 低频信号解码单元,用于对所述低频音频信号解码;所述低频音频信号编解码产生第一延时; 所述高频信号编码单元具体用于对所述高频音频信号进行第一延时后编码,所述高频音频信号编码产生第二延时;使得音频信号编解码延时是第一延时和第二延时之和; 或者,所述高频信号编码单元具体用于对所述高频音频信号编码,所述高频音频信号编码产生第二延时;当所述第一延时小于等于第二延时时,所述低频信号编码单元对所述低频音频信号编码后延时第二延时与第一延时之差,使得音频信号编解码延时是第二延时;当所述第一延时大于第二延时时,所述低频信号编码单元对所述高频音频信号编码后延时第一延时与第二延时之差;使得音频信号编解码延时是第一延时; 14. The audio signal coding apparatus according to claim 9, characterized in that said apparatus further comprises: a low-frequency signal decoding unit for decoding said low-frequency audio signal; a low-band audio signal to generate a first codec delay when; frequency signal encoding unit specifically for the high frequency audio signal after a first delay coding, the high-frequency generating a second audio signal coding delay; that the audio signal is a first codec delay delay and a second delay sum; Alternatively, the high frequency signal encoding unit configured to encode the high frequency audio signal, the encoded audio signal to generate a second high-frequency delay; when the first extension when a second or less delay, the low frequency signal of the encoding means encoding said low frequency audio signal and a first delay difference between the delay of the second delay, so that the audio codec delay is a second delay; when the first delay is greater than a second delay, the low frequency signal encoding unit encoding an audio signal after the frequency difference between the delay of the first delay and the second delay; that the audio codec delay the first delay; 者,所述高频信号编码单元具体用于对所述高频音频信号进行第三延时后编码,所述高频音频信号编码产生第二延时;当所述第一延时小于等于第二延时时,所述低频信号编码单元对所述低频音频信号编码后延时第二延时和第三延时与第一延时之差,使得音频信号编解码延时是第二延时和第三延时之和;当所述第一延时大于第二延时时,所述高频信号编码单元对所述高频音频信号编码后延时第一延时与第二延时、第三延时和之差,或者所述低频信号编码单元对所述低频音频信号编码后延时第二延时加第三延时与第一延时之差,使得首频彳目号编解码延时是第一延时或第二延时和第二延时之和。 By said high frequency signal encoding unit specifically for the high frequency audio signal after a third delay coding, the high-frequency generating a second audio signal coding delay; when the first delay is less than equal to the second delay means for encoding the low frequency signal after said low-frequency audio signal and the encoded second delay difference between the first and third delay of the delay, so that the audio signal delay is a second delay codecs and the sum of the third delay; when the first delay is greater than a second delay, the high frequency signal encoding unit delays the first delay and the second delay signal after the high-frequency audio coding, and a third delay difference, or the low frequency signal encoding unit encoding the audio signal of the low frequency second delay difference between the first and the third delay added to the delay, so that the frequency of the first entry number codec left foot the first or second delay is the delay and the delay of the second delay and.
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